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//===- ReduceArguments.cpp - Specialized Delta Pass -----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements a function which calls the Generic Delta pass in order
// to reduce uninteresting Arguments from defined functions.
//
//===----------------------------------------------------------------------===//
#include "ReduceInstructions.h"
using namespace llvm;
/// Removes out-of-chunk arguments from functions, and modifies their calls
/// accordingly. It also removes allocations of out-of-chunk arguments.
static void extractInstrFromModule(std::vector<Chunk> ChunksToKeep,
Module *Program) {
Oracle O(ChunksToKeep);
std::set<Instruction *> InstToKeep;
for (auto &F : *Program)
for (auto &BB : F) {
// Removing the terminator would make the block invalid. Only iterate over
// instructions before the terminator.
InstToKeep.insert(BB.getTerminator());
for (auto &Inst : make_range(BB.begin(), std::prev(BB.end())))
if (O.shouldKeep())
InstToKeep.insert(&Inst);
}
std::vector<Instruction *> InstToDelete;
for (auto &F : *Program)
for (auto &BB : F)
for (auto &Inst : BB)
if (!InstToKeep.count(&Inst)) {
Inst.replaceAllUsesWith(UndefValue::get(Inst.getType()));
InstToDelete.push_back(&Inst);
}
for (auto &I : InstToDelete)
I->eraseFromParent();
}
/// Counts the amount of basic blocks and prints their name & respective index
static unsigned countInstructions(Module *Program) {
// TODO: Silence index with --quiet flag
outs() << "----------------------------\n";
int InstCount = 0;
for (auto &F : *Program)
for (auto &BB : F)
// Well-formed blocks have terminators, which we cannot remove.
InstCount += BB.getInstList().size() - 1;
outs() << "Number of instructions: " << InstCount << "\n";
return InstCount;
}
void llvm::reduceInstructionsDeltaPass(TestRunner &Test) {
outs() << "*** Reducing Instructions...\n";
unsigned InstCount = countInstructions(Test.getProgram());
runDeltaPass(Test, InstCount, extractInstrFromModule);
}
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